49
Caution on Piping Handling
• Protect the open end of the pipe against dust and
moisture.
• All pipe bends should be as gentle as possible.
Use a pipe bender for bending. (Bending radius
should be 30 to 40mm or larger.)
Selection of copper and heat insulation materials
When using commercial copper pipes and fittings,
observe the following:
• Insulation material: Polyethylene foam
• Heat transfer rate: 0.041 to 0.052W/mK(0.035
to 0.045kca/mh
• Refrigerant gas pipe’s surface temperature
reaches max. 110°C. Choose heat insulation ma-
terials that will withstand this temperature.
Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Gas side Liquid side Gas pipe insulation
Liquid pipe
insulation
9K/12K 18K 9K/12K 18K
9.5 mm 12.7 mm 6.4mm 12-15 mm 14-16 mm 8-10 mm
Thickness 0.8 mm Thickness 10 mm Min.
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Be sure to
place a cap
Inter-unit wiring
Liquid pipe
Finising tape
Liquid pipe
insulation
Gas pipe
insulstion
Gas pipe
If no flare cap is
available,cover the
flare mouth with
tape to keep dirt or
water out.
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